I think something you are missing is that we can't 'defeat and remove' Netanyahu. He is the democratically elected leader of a sovereign state. Even if we could it isnt our place to remove him and even if we could removing him isn't going to fix the issue of extremist settlers or suddenly remove the 10% of Israelis that have chosen to live on illegally occupied land.
All the West can do is choose not support Netanyahu, his government and the IDF. That's all people have been asking for for months. We can't stop the slaughter but the same way we don't arm Iran or Hamas or Russia we can choose not to arm Israel and be participants in it. We can choose to sanction Israel the same way we sanction Iran or Russia so we aren't complicit in what they are doing. These measures still give Israelis the right to self determination, if they choose they can still choose to illegally occupy, they can still choose to allow violent settlers, they can still choose to have a far right government, they can still choose to defend themselves in whatever way they see fit but we aren't supporting and helping them to do so.
'Defeating and removing' the democratically elected government of another country just isn't something that we have any business doing, the same way in the UK someone coming over and removing the government isn't something any other country has any right to do.